How many major glaciations (or ice ages) have occurred in Earth's history?
How did early humans adapt to the cold weather of the Ice Age?
During the Neolithic Age, a shift occurred from food gathering to food producing. What were the two ways in which early humans produced food?
Where do historians believe farming begin?
The passage reads:
"Scientists can only guess how farming began. One theory is a gatherer noticed that plants grew where wild grains had been spilled by accident."
What conclusion can be drawn from the term "gatherer?"